This bill failed to get out of committee in all of the 18 states that floated it in 2008. But we will watch for its return. 

- Every case of iron powder you buy ...
Every barrel of aluminum powder ...
Every canister of sulfur ...
Every magnesium strip... 

Because thermite can be just about as explosive as gun powder if mixed properly ...

And with thermite, you might not even need the slug.

Related I was at this picnic and I believe the number present was much higher then reported. http://www.wqow.com/Global/story.asp?S=10977230